共喷气中氢组分对低碳高炉滚道燃烧特性的影响

IF 8.3 2区工程技术 Q1 CHEMISTRY, PHYSICAL

International Journal of Hydrogen Energy Pub Date : 2023-04-08 DOI:10.1016/j.ijhydene.2022.06.106

Mengmeng Ren , Wenwen Liu , Junxue Zhao , Chong Zou , Lei Ren , Hao Wu , Jun Zhao

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引用次数: 3

摘要

煤富氢气与风口鼓氧共喷是一种很有前途的低碳排放高炉炼铁技术，有利于氢基还原和经济实惠的碳捕集技术的发展。数值研究了共喷气中氢气含量对滚道内燃烧特性的影响。结果表明:共喷气中氢组分的增加，加速了共喷气的优先燃烧，促进了煤粉的预热和热解;这弥补了吸氧效应，使煤的燃尽率从83.2%提高到86.8%，共注气中氢含量从20 vol%提高到80 vol%。共注气中CO/H2摩尔比为8:2、6:4、4:6和2:8时，出口CO/H2摩尔比分别为54:46、42:52、32:68和24:76。燃烧、气化和水煤气转移反应共同作用于还原性气体的再分配。

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Effects of hydrogen fraction in co-injection gas on combustion characteristics of the raceway in low carbon emission blast furnace

Co-injection of coal and hydrogen-rich gas with oxygen blast at tuyere is a promising technology for low carbon emission blast furnace ironmaking, which favors the development of hydrogen-based reduction and affordable carbon capture. Effects of hydrogen fraction in the co-injection gas on the combustion characteristics in raceway are numerically studied. Results show that increase of hydrogen fraction in the co-injection gas accelerates the preferential combustion of the injected gas, which promotes the preheating and pyrolysis of pulverized coal. This compensates the oxygen-grabbing effect and improves the burnout of coal from 83.2% to 86.8% with the hydrogen fraction in co-injection gas increase from 20 vol% to 80 vol%. With the CO/H₂ molar ratios in the co-injection gas of 8:2, 6:4, 4:6 and 2:8, the outlet CO/H₂ molar ratios are 54:46, 42:52, 32:68 and 24:76 respectively. Combustion, gasification and water-gas shift reactions play conjoint roles in the redistribution of reducing gas species.

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来源期刊

International Journal of Hydrogen Energy 工程技术-环境科学

CiteScore

13.50

自引率

25.00%

发文量

3502

审稿时长

60 days

期刊介绍： The objective of the International Journal of Hydrogen Energy is to facilitate the exchange of new ideas, technological advancements, and research findings in the field of Hydrogen Energy among scientists and engineers worldwide. This journal showcases original research, both analytical and experimental, covering various aspects of Hydrogen Energy. These include production, storage, transmission, utilization, enabling technologies, environmental impact, economic considerations, and global perspectives on hydrogen and its carriers such as NH3, CH4, alcohols, etc. The utilization aspect encompasses various methods such as thermochemical (combustion), photochemical, electrochemical (fuel cells), and nuclear conversion of hydrogen, hydrogen isotopes, and hydrogen carriers into thermal, mechanical, and electrical energies. The applications of these energies can be found in transportation (including aerospace), industrial, commercial, and residential sectors.